cabal sandboxes executable path

[Roman Cheplyaka]

* Konstantine Rybnikov <k-bx at k-bx.com> [2013-12-27 08:21:39+0100]
> On Fri, Dec 27, 2013 at 1:02 AM, Roman Cheplyaka <roma at ro-che.info> wrote:
> >
> > * Tom Ellis <tom-lists-haskell-cafe-2013 at jaguarpaw.co.uk> [2013-12-26 19:33:19+0000]
> > > On Thu, Dec 26, 2013 at 08:18:40PM +0100, Konstantine Rybnikov wrote:
> > > > Wow, this is a real surprise for me! Thank for clarifying that!
> > > >
> > > > I hope it's just me who missed this important information. Could you please
> > > > share where was it described and how people know about it?
> > >
> > > This is a surprise to me too.  What's the difference between the executable
> > > in 'dist' and the final one?   What happens if I just do 'cabal build'?  Is
> > > the final one not actually built?
> >
> > In that case the executable is built (and placed under dist/), just not
> > copied to the final destination (such as ~/.cabal/bin or .cabal-sandbox/bin).
> >
> > This is much like traditional make && make install.
> 
> The problem here (for me at least) that they're different, it's not
> just "copying". At least in size in my case (20mb and 30 mb, looks
> like one is stripped, but what else?).

Yes, it's stripped. Nothing else at the moment, from what I can tell:

  installBinary dest = do
    installExecutableFile verbosity
      (buildPref </> exeName exe </> exeFileName)
      (dest <.> exeExtension)
    when (stripExes lbi) $
      Strip.stripExe verbosity (withPrograms lbi) (dest <.> exeExtension)

(Distribution/Simple/GHC.hs)

> So it's strange that in one
> case dist/ contains "temporary build file that differs from end-one",
> and then (on build) it contains actual binary.

Not sure what you mean here. Stripping occurs after copying, in the
destination directory. The binary in dist/ is never stripped.

> I think we should at least make sure the files are equal (do all steps
> in dist/ and then copy binary), or, if this is not acceptable, at
> least write a note about that everywhere :)

Can you explain why this matters?

Stripping on install makes perfect sense. dist/ should only be used for
development purposes, so we're saving some time by not stripping.

OTOH, `cabal install` is clearly for installation/deployment.

Again, this is consistent with what make and make install have been
doing for a long time.

(BTW, I don't think libraries@ is the right list for this discussion.
It's for discussing changes to the core libraries.
haskell-cafe would be a better choice.)

Roman
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